Direct fast blue FFRL can be used for dyeing cotton, viscose fiber, silk and their blended fabrics, but generally not for printing. Dyed cotton and viscose fibers are bright blue, with good levelness, medium migration and poor dye uptake. Good light fastness and poor washing fastness. It is mostly used for fabrics with less washing times. It can dye polyester viscose blended fabrics in the same bath with disperse dyes at high temperature, and the color light is slightly red.